CHAPTER
4
Testing AC and
Grounding Systems for
Polarity, Voltage Drop,
Impedance, and Frequency
I
n the “old days,” the tools of choice for working around AC systems on boats were the
DVOM and maybe an oscilloscope. Today, the advanced technician or boatowner can
easily test conductor impedance, polarity, frequency level, voltage drop, and peak RMS
voltage with a circuit analyzer.The SureTest Circuit Analyzer
As far as I can determine, the SureTest circuit analyzer from Ideal Industries is a unique
instrument that, although now in its second generation, still represents the only example
of this new category of test devices. Our discussion will use model 61-164. (A sister model
is available that adds a testing capability for arc fault circuit interrupters, but since AFCIs
are not used on boats, this feature is not of interest to us.)
As with many of the tools outlined in this book, the SureTest 61-164 circuit analyzer
uses a microprocessor, which allows it to perform six extremely important tests on an AC
system in a matter of seconds. It comes with probes for testing receptacles and has an
optional alligator clip. At around $250, I consider this tool to be worth every penny and
an absolute necessity for anyone working around AC systems.
Now, let’s go through each test function one by one.SureTest model 61-164, Ideal Industries, Inc., http://www.idealindustries.comCIRCUIT ANALYZERCopyright © 2007 by Edwin R. Sherman. Click here for terms of use.